1 files changed, 5 insertions, 5 deletions
diff --git a/backend/List.h b/backend/List.h
index 1d8893e..58efbe2 100644
--- a/backend/List.h
+++ b/backend/List.h
@@ -18,7 +18,7 @@ struct ListLink {
 template<typename T>
 class List {
 public:
-	size_t size();
+	size_t size() const;
 
 	void push_back(T & el);
 	void remove(const T & val);
@@ -27,11 +27,11 @@ public:
 
 	void clear();
 
-	T & operator [] (size_t index);
+	T & operator [] (size_t index) const;
 
-	ListIterator<T> begin();
-	ListIterator<T> end();
-	ListRange<T> range();
+	ListIterator<T> begin() const;
+	ListIterator<T> end() const;
+	ListRange<T> range() const;
 
 private:
 	ListLink<T> * head = nullptr;